72 lines
2.2 KiB
Python
72 lines
2.2 KiB
Python
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#!/usr/bin/env python3
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####################
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# Inspiration / Further Reading
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####################
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# https://github.com/chrisjbillington/inotify_simple
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# https://stackoverflow.com/questions/16148735/how-to-implement-a-watchdog-timer-in-python
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####################
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# Dependencies
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####################
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# apt install python3 python3-pip python3-dbus
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# pip3 install inotify_simple
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from inotify_simple import INotify, flags
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import os
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from threading import Timer
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####################
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# Simple watchdog timer class
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####################
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class Watchdog:
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def __init__(self, timeout, userHandler=None): # timeout in seconds
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self.timeout = timeout
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self.handler = userHandler if userHandler is not None else self.defaultHandler
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self.timer = Timer(self.timeout, self.handler)
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# Do NOT start timer by default ; we want this triggered by reset events that come through
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# via the inotify filesystem watcher
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#self.timer.start()
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def reset(self):
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self.timer.cancel()
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self.timer = Timer(self.timeout, self.handler)
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self.timer.start()
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def stop(self):
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self.timer.cancel()
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def defaultHandler(self):
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raise self
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####################
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# Setup inotify on folder(s)
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####################
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inotify = INotify()
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watch_flags = flags.CREATE | flags.DELETE
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wd = inotify.add_watch('/tank/pictures', watch_flags)
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####################
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# Restart fim slideshow once inotify storm is over (3s timeout)
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####################
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def inotify_handler():
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print('restarting fim slideshow')
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import dbus
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sysbus = dbus.SystemBus()
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systemd1 = sysbus.get_object('org.freedesktop.systemd1', '/org/freedesktop/systemd1')
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manager = dbus.Interface(systemd1, 'org.freedesktop.systemd1.Manager')
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job = manager.RestartUnit('fim.service', 'fail')
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####################
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# Watch for inotify events in an infinate loop
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# This will BLOCK waiting for events within inotify.read(None)
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# This makes it pretty safe for an infinate loop scenario
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####################
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watchdog = Watchdog(3.0, inotify_handler)
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while True:
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for event in inotify.read(None):
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print(event)
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watchdog.reset()
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for flag in flags.from_mask(event.mask):
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print(' ' + str(flag))
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